What kind of nails are these?

What kind of nails are these?

Just standard flat head painted exterior trim nails. As for missing nails, if you are talking about that piece, it does not appear, since every 3' is about right for that trim around the garage door. You want to be able to replace it, in case the rubber sweep gets torn up, and placing more nails is counter productive if you ever have to pull it.

What kind of nails are these?

Those are not pneumatic nails! As AgentW and greg said, they are run of the mill trim nails. However, I would be willing to bet that they are no longer than 1-1/4". That is what we always used for alumunimum trim and these door seals. I did not even know they made them bigger than this. Any box store will have them. If you want to add a few more, drill a small pilot hole first in the piece first (not into the wood framing)